415 9th Street
415 9th Street, between Sixth and Seventh Avenues · Park Slope
BBL 3010060055 · BIN 3022183
- Year built
- 1912
- Type
- Cooperative
- Landmark
- No
- Amenities
- Resident superintendent; roof deck; landscaped courtyard; common laundry; apartment storage; bicycle storage; voice intercom
Every recorded sale at this building, 2004–2025
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 2BR median
- $957K
- Recent range
- $680K – $1.1M
- Listing discount
- 0.1%
- Recorded transfers
- 38
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A Private Pricing Opinion — what your apartment at 415 9th Street would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.
415 9th Street combines a prewar walk-up with two distinct common outdoor areas: a roof deck above the surrounding blocks and a planted courtyard at the rear. A resident superintendent, laundry and individual storage give this small cooperative more shared infrastructure than its stair-access format alone suggests.
The building stands on the 9th Street transit corridor, between Sixth and Seventh Avenues. The Seventh Avenue F and G station is close to the building, and Prospect Park lies farther east along the same street. The apartments retain the proportions of an early twentieth-century walk-up, including separate rooms, tall windows and multi-exposure layouts.
The residential inventory includes one-, two- and three-bedroom configurations. Some larger bedroom counts fit within modest overall footprints; the arrangement of rooms and number of bathrooms therefore distinguish homes that share a bedroom label. Upper floors have traded actively alongside lower-floor apartments.
Architecture and unit composition
The 1912 building includes apartments with parquet floors, crown moldings, French doors, exposed brick and decorative columns. These details survive unevenly through successive renovations. Some homes retain a more compartmentalized plan, while others connect a windowed kitchen to the principal living space.
Split-bedroom configurations place sleeping rooms apart from one another. In larger layouts, the main bedroom can face the rear treetops while living rooms face south toward 9th Street. Upper-floor homes can have views extending above nearby roofs toward Manhattan. Light and outlook depend on both elevation and which side of the building a room occupies.
The bathroom count varies: two-bedroom homes include both one- and two-bath arrangements. Three-bedroom layouts also appear in the resale inventory. Windowed kitchens and in-unit laundry are present in some apartments, and individual renovations have changed the extent of open living space.
Building operations
The roof deck has planted beds and seating areas, with broad views over the neighborhood. The separate courtyard includes grilling space. Both are shared facilities, so an apartment can have access to outdoor space without a private terrace or garden attached to its floor plan.
A common laundry room, dedicated apartment storage and bicycle storage serve the building. The resident superintendent provides on-site coverage, and the entrance uses a voice intercom. Access to the apartments and roof is by stairs.
The building's R6B zoning permits substantially less residential floor area than the existing structure contains. The property is outside an LPC-designated district. Its single cooperative tax lot is assessed in Class 2, with no development abatement identified.
Policy framework
Pets: Cats and dogs allowed — confirm with the managing agent.
In-unit washer/dryer: Confirm permission for a new installation with the managing agent.
Recent sales
Recent transfers at this building, curated by The Roebling Team research desk. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | vs. Ask |
|---|---|---|---|---|
| Oct 22, 2025 | 53 | 3 BR · 1 BA | $1,150,000 | +4.5% |
| Sep 10, 2025 | 41 | 2 BR · 2 BA | $999,000 | -0.1% |
| Oct 7, 2024 | 1 | 2 BR · 1 BA | $680,000 | -2.7% |
| Oct 25, 2023 | 43 | 2 BR · 2 BA | $1,050,000 | -12.5% |
| Feb 10, 2023 | 34 | 2 BR · 1 BA | $915,000 | +2.2% |
| Sep 9, 2022 | 54 | 2 BR · 1 BA | $930,000 | +3.9% |
| Jan 28, 2022 | 53 | 3 BR · 1 BA | $960,000 | +7.3% |
| Nov 30, 2021 | 52 | 3 BR · 1 BA | $795,000 | +0.0% |
Market read. $/sf is measured on the latest sales with reliable square footage (2006): a median $641/sf across 1 sale. The building has traded as recently as 2025. Median listing discount 0.0% from the last ask.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01006-0055) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price.
At the recent median sale of $999K (3 transfers since 2024), a buyer putting 25% down would pay about $12,296 to close, or 1.2% of the price.
- Mansion tax: $0
- No mortgage recording tax or title insurance on a co-op purchase
- Attorneys, lender, building fees and filings: $12,296
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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Comparable buildings
- 459 12th Street: A smaller prewar cooperative for comparing low-rise ownership nearby.
- 86 Prospect Park West: A similarly sized prewar cooperative with a park-side address.
- 75 Prospect Park West: A prewar cooperative of comparable scale on the park boundary.
- 240 8th Street: A smaller cooperative on an interior Park Slope block.
- 443 12th Street: A warehouse conversion with a larger cooperative inventory and a different original building form.
More Park Slope buildings
- 409 Third Street — 1921 condominium
- 41 Park Place — condominium
- 412 & 420 Eighth Avenue, 412 and 420 Eighth Avenue — 1920 condominium
- 418 17th Street — 1920 condominium
- 420 12th Street (Ansonia Court) — 1880 co-op
- 421 Fourth Street, 421 Fourth Street · Park Slope — 1899 co-op
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Park Slope.
The full playbook — what goes in the package, how boards read your financials, the interview, and the timeline — plus sample cover, reference, and personal letters you can adapt.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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